Kev is running some tests and he will reply to you in due time. If the bike is running fine then it's one less thing for you to worry, rest assured that with or without it connected there will be no damage to your bike.

Cheers

I am going to do some tests soon.

I want to recheck the O2 sensor voltage out put using an Osiliscope again, but on the dyno under load at 15% throttle to gauge the voltage.

With this info it will help me make a voltage regulator & we will see if I can fix the surge.

I know the voltage with the bike running at 3000RPM, but not under load. :YellowCrazy_J8GDC6:

the tps vs open/closed loop seems to explain the surging then ?
Im guessing that when you are at 3-4k rpm under little load (motorway etc) the you would be at about 15% tps. My dealer mentioned that changing the tps zero point could move the "surge" so ....

Hopefully Kevs works on the eliminator will be applicable to us aprillia 650 riders too !

just put a deposit down on an 09 XTX.... i sold my 05 one a while ago for this problem... i cant belive yamaha havent sorted this out yet. It worrying me a little, i love the XT but my old one ran really nasty.

Just wondered, i have a Yamaha FZ1 and they suffered with bad jerking problems too... this was sorted but stopping the secondary throttle flies from shutting off, dont spose the XT has them????

Hi there cdo1uk, :welcome: back to :660: and congratulations on your new bike.

There is no secondary throttle butterly I am sure Kev will be able to confirm.

Don't knock the bike before you get it, rest assured you have nothing to worry about, the surging that some of the new owners have experienced was down to poor setup from the dealership, i.e. low idleing speed, incorrect tps position, slack chain, but once these are set up properly you have a much more reliable bike.

Show us some pics as soon as you get it.

thanks for that... im really looking forward to getting it.

The 09 XTX has a new ECU with reported improvements with surging over the 07/08 models from 09 owners.

I was at one of the Yamaha dealers on Saturday asking if they could get me a new XTX 09 model, we will see this week what they say. If I can't get a new 09 XTX my XT adventure will soon be coming to a forced end. Yamaha Australia have said no more XTX's to be imported.

I,m a bit confused now.i need my bike to run good at speeds 30mph and under, for a long offroad trip.
will a powercommander cure the surging at these speeds ,or not.above 35/40mph the bike runs really well.?

Oh , its an 07 model 660r.

A power commander will help but will not cure the surge.